JPS56121022A - Automatic dimming strobe device - Google Patents

Automatic dimming strobe device

Info

Publication number
JPS56121022A
JPS56121022A JP2387280A JP2387280A JPS56121022A JP S56121022 A JPS56121022 A JP S56121022A JP 2387280 A JP2387280 A JP 2387280A JP 2387280 A JP2387280 A JP 2387280A JP S56121022 A JPS56121022 A JP S56121022A
Authority
JP
Japan
Prior art keywords
capacitor
charging voltage
voltage
main
amplifier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2387280A
Other languages
Japanese (ja)
Inventor
Takashi Tsukatani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP2387280A priority Critical patent/JPS56121022A/en
Priority to US06/236,903 priority patent/US4344684A/en
Priority to AT81101453T priority patent/ATE8557T1/en
Priority to EP81101453A priority patent/EP0035261B1/en
Priority to DE8181101453T priority patent/DE3164803D1/en
Publication of JPS56121022A publication Critical patent/JPS56121022A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
    • H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation
    • H05B41/325—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation by measuring the incident light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Soil Working Implements (AREA)
  • Massaging Devices (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Abstract

PURPOSE:To prevent improper exposure, such as overexposure, due to erroneous commutation by announcing clearly the completion of light emission and dimming preparation by a tone. CONSTITUTION:As power source 11 is put to work, main and commutating capacitors 12 and 18 are charged. The charging voltage of main capacitor of main capacitor 12 is applied to the inverted input terminal of operational amplifier 28. Further, the charging voltage of capacitor 18 is applied to the inverted input terminal of this amplifier 28 and also applied to the inverted input terminal operational amplifier 24. When the charging voltage of main capacitor 12 does not reach the discharge starting voltage or when the charging voltage of commutating capacitor 18 does not reach the commutable voltage, the output of amplifier 28 is held at level H and when the charging voltage of commutating capacitor 18 does not reach the commutable voltage, the output of amplifier 24 is held at level H. Therefore, when main and comutating capacitors 12 and 18 are charged imcompletely, buzzer 33 is put into operation. Thus, improper exposure can be prevented.
JP2387280A 1980-02-27 1980-02-27 Automatic dimming strobe device Pending JPS56121022A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2387280A JPS56121022A (en) 1980-02-27 1980-02-27 Automatic dimming strobe device
US06/236,903 US4344684A (en) 1980-02-27 1981-02-23 Automatic photoflash device
AT81101453T ATE8557T1 (en) 1980-02-27 1981-02-27 AUTOMATIC FLASHING DEVICE.
EP81101453A EP0035261B1 (en) 1980-02-27 1981-02-27 Automatic photoflash device
DE8181101453T DE3164803D1 (en) 1980-02-27 1981-02-27 Automatic photoflash device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2387280A JPS56121022A (en) 1980-02-27 1980-02-27 Automatic dimming strobe device

Publications (1)

Publication Number Publication Date
JPS56121022A true JPS56121022A (en) 1981-09-22

Family

ID=12122530

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2387280A Pending JPS56121022A (en) 1980-02-27 1980-02-27 Automatic dimming strobe device

Country Status (5)

Country Link
US (1) US4344684A (en)
EP (1) EP0035261B1 (en)
JP (1) JPS56121022A (en)
AT (1) ATE8557T1 (en)
DE (1) DE3164803D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11534503B2 (en) 2017-12-28 2022-12-27 Profusa, Inc. Oxidase-based sensors and methods of using

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719288A (en) * 1953-06-11 1955-09-27 Eastman Kodak Co Circuit failure detecting device
US3591829A (en) * 1967-04-20 1971-07-06 Minolta Camera Kk Automatic control device for electronic flash
US3626401A (en) * 1969-03-19 1971-12-07 Berkey Photo Inc Fail to flash indicator circuit
JPS522619B2 (en) * 1972-05-30 1977-01-22
US3778672A (en) * 1972-07-27 1973-12-11 Ponder & Best Audible alert signal for an electronic flash unit
US3953928A (en) * 1975-04-25 1976-05-04 Great Lakes Carbon Corporation Cooling of hot particulate material particularly calcined petroleum coke
US3993928A (en) * 1975-12-19 1976-11-23 Honeywell Inc. Extended range correct exposure annunciator
US4122465A (en) * 1976-06-23 1978-10-24 Nippon Kogaku K.K. Device for indicating condition of exposure in an automatic control type electronic flash unit for flash photography
US4193677A (en) * 1977-07-29 1980-03-18 Nippon Kogaku K.K. Warning circuit in an auto-controlled flashlight photographing device
JPS5429036A (en) * 1977-08-09 1979-03-03 Mitsubishi Electric Corp Numerical controller
JPS5910718Y2 (en) * 1978-05-18 1984-04-03 ウエスト電気株式会社 Notification device for automatic dimming electronic flash device

Also Published As

Publication number Publication date
ATE8557T1 (en) 1984-08-15
EP0035261B1 (en) 1984-07-18
US4344684A (en) 1982-08-17
DE3164803D1 (en) 1984-08-23
EP0035261A1 (en) 1981-09-09

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